大西高铁聚氨酯固化道床施工中轨道变形控制措施研究  

Research on Deformation Control Measure in Construction of Polyurethane Solidified Ballast Bed for Datong-Xi'an High Speed Railway

作　　者：郄录朝[1] 王红[1] 徐旸 许永贤[1] 许良善[1] QIE Luchao;WANG Hong;XU Yang;XU Yongxian;XU Liangshan(Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《中国铁道科学》2018年第4期1-7,共7页China Railway Science

基　　金：中国铁路总公司科技研究开发计划项目(2014G002-H);北京市科技计划课题项目(Z161100001016005)

摘　　要：聚氨酯固化道床在施工中,材料聚合反应产生体积膨胀,导致轨道变形。由于固化道床施工是在轨道精调完成后进行,控制浇注施工中轨道变形,对于高速铁路轨道的平顺性尤为重要。采用热—力耦合模型对聚氨酯固化材料的膨胀行为进行模拟,并用膨胀力测试试验结果对热—力耦合模型中的关键参数进行标定。基于验证后的热—力耦合模型,针对大西高铁的实际线路情况,建立大西高铁路基基础聚氨酯固化道床膨胀力时变仿真模型,分析浇注方式、保压荷载幅值及作用点对轨道几何尺寸变化的影响。结果表明,聚氨酯固化道床单点浇注工艺必须采取保压措施,且建议作用点间距为1.2m、4点加载、荷载总量为30kN。现场施工时轨道变形测试结果表明,优化保压设备后,钢轨10m弦高低可控制在2mm以内,满足高速铁路轨道平顺性要求。The aggregate expansion of polyurethane causes track deformation during the construction of polyurethane solidified ballast bed.Since the construction of solidified ballast bed is carried out after the fine adjustment of the track is completed,controlling track deformation during pouring construction is particularly important for the track smoothness of high speed railway.In this paper,the thermal-mechanical coupling model was used to simulate the swelling behavior of polyurethane curing material.The key parameters in the thermal-mechanical coupling model were calibrated by the test results of swelling force.Based on the verified thermal-mechanical coupling model and in view of the actual line conditions of Datong-Xi＇an high speed railway,a time-varying simulation model for the swelling force of polyurethane solidified ballast bed was established for the roadbed foundation of Datong-Xi＇an high speed railway.The influence of pouring methods,pressure maintaining load amplitude and load action point on the change of track geometry was analyzed.Results show that the pressure maintaining measure must be adopted in the single point pouring process for polyurethane solidified ballast bed.It is suggested that the spacing between load action points should be 1.2 m,four-point loading should be adopted and the total load should be 30 kN.The test results of track deformation during field construction show that,after optimizing the pressure maintaining equipment,the high and low control for the 10 m chord of rail can be controlled within 2 mm,which meets the demand for the track regularity of high speed railway.

关 键 词：大西高铁 聚氨酯固化道床 有限元法 变形控制措施 热—力耦合模型 

分 类 号：U213.7[交通运输工程—道路与铁道工程]